Question 29
Which of the following serves as a clue that can serve as proof that Mars used to be not hostile to life as it is today?
Editorial review: distinguish clues of past habitability from proof of life and assess the breadth of each option.
Original choices:
A. dried-up lake beds on Mars
B. dried-up river channels and deltas on Mars
C. rocks and minerals on Mars
D. volcanoes on Mars
E. all of the above
Editorial review: distinguish clues of past habitability from proof of life and assess the breadth of each option.
Original choices:
A. dried-up lake beds on Mars
B. dried-up river channels and deltas on Mars
C. rocks and minerals on Mars
D. volcanoes on Mars
E. all of the above